need some advice.

hello everyone, i'm from the crohns forum and i just need some advice and understanding because i think I'm depressed. I've tried for awhile to just ignore these feelings but i'm realizing now their not going away. i think what triggered this was crohns and my parents divorce. i'm naturally a quiet and reserved person but for the last year I've been really negative about stuff and i don't know why. after my mom left i was left with a lot of responsibility to take care of my family like cooking, cleaning, house work, and trying to keep whats left of my family together. i'm only 17 but i feel like life is passing by and i'm just stuck at home. i'm taking classes at a college trying to get my ged but the majority of my time i spend at home. i just feel so alone i don't know what to do. i'm extremely bad at making friends and i don't have anything in common with kids my age, i feel so much older then i am. some-days i'm happy but when i start thinking negatively everything just goes down hill and i'm a mess. i feel like i'm trudging though life and not enjoying too much of it. i'm lost and don't know how to find my true character and potential. my siblings and dad don't even understand what im going through, they think depression isn't real and its a choice. i never wanted any of this to happen but it is and its not something i can just make go away. sorry i went on so long about this, anyone who has any advice or input would really mean a lot to me. thanks for reading.

thank you so much for your thoughts and advice.